Solar cell



FIG. 1 is a front perspective view of a solar cell;

FIG. 2 is back perspective view thereof;

FIG. 3 is a front view thereof

FIG. 4 is a back view thereof

FIG. 5 is a top view thereof;

FIG. 6 is a first side view thereof;

FIG. 7 is a second side view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a detailed view taken at area 9 on FIG. 3;

FIG. 10 is a detailed view taken at area 10 on FIG. 3;

FIG. 11 is a detailed view taken at area 11 on FIG. 3;

FIG. 12 is a detailed view taken at area 12 on FIG. 4;

FIG. 13 is a detailed view taken at area 13 on FIG. 4;

FIG. 14 is a detailed view taken at area 14 on FIG. 4; and,

FIG. 15 is a detailed view taken at area 15 on FIG. 5.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for solar cell, as shown and described. 